Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions

I pulled the carb off my ST824 to clean it out.  Just put it all back together and put it back on the machine.  I set the baseline adjustments to the idle and main mixture screws per the tecumseh HM80 service manual.  Adjusted the screws at high and low throttle settings like the manual states on got it running smooth at all throttle settings.  Problem is when I engage the impeller with the throttle full open the engine starts surging.  I'm new to playing with carburators, any ideas?

make sure the belt is routed correcty.  under brakes pads  NOT over them... under belt guides NOT over them....  i see this alot in the shop.  most of the time the blower housing should be removed to do a proper job for a novice....